Open Question: Insurance agent lied to me. What can I do?

My father was hospitalized and had to be admitted to the ICU. As he began recovery, he was declared "medically stable" and transferred to another floor. He has a terminal illness but this was not his time to pass. His insurance agent contacted us and told us that when he was in ICU he was covered but that since he transferred out of ICU they would no longer cover his medical expenses and